自己写的嵌入linux驱动试验程序源码

在Arm5VI板上调试成功，希望能给在嵌入系统下写驱动的朋友一些帮助。

这是驱动程序:test.c

//=========================================
#define __NO_VERSION__

#include <linux/module.h>
#include <linux/config.h>
#include <linux/version.h>

#include <asm/uaccess.h>

#include <linux/types.h>
#include <linux/fs.h>
#include <linux/mm.h>
#include <linux/errno.h>
#include <asm/segment.h>

unsigned int test_major = 0;

static ssize_t read_test(struct file *file,char *buf,size_t count,loff_t *f_pos)

{ int left;

if (verify_area(VERIFY_WRITE,buf,count) == -EFAULT )
return -EFAULT;

for(left = count ; left > 0 ; left--)
{
__put_user(1,buf);
buf++;
}

return count;
}

static ssize_t write_test(struct file *file, const char *buf, size_t count, loff_t *f_pos)
{
return count;
}

static int open_test(struct inode *inode,struct file *file )

{
MOD_INC_USE_COUNT;
return 0;
}

static int release_test(struct inode *inode,struct file *file )
{
MOD_DEC_USE_COUNT;
return 0;
}

struct file_operations test_fops = {
read:read_test,
write:write_test,
open: open_test,
release:release_test
};

int init_module(void)
{
int result;
result = register_chrdev(0, "test", &test_fops);
if (result < 0) {
printk(KERN_INFO "test: can't get major number/n");
return result;

}

if (test_major == 0) test_major = result; /* dynamic */

return 0;

}

void cleanup_module(void)

{

unregister_chrdev(test_major, "test");

}

int init_test(void)
{
int result = register_chrdev(0, "test", &test_fops);
if (result < 0) {
printk(KERN_INFO "test: can't get major number/n");
return result;
}

if (test_major == 0) test_major = result; /* dynamic */

printk(KERN_INFO "test: Register test dev successfully!/n");
return 0;

}

MODULE_LICENSE("GPL");
MODULE_AUTHOR("BECKHAM");

下面是测试程序：Mytest.c

#include <stdio.h>

#include <sys/types.h>

#include <sys/stat.h>

#include <fcntl.h>

main()

{

int testdev;

int i;

char buf[10];

testdev = open("/dev/test",O_RDWR);

if ( testdev == -1 )

{

printf("Cann't open file /n");

exit(0);

}

read(testdev,buf,10);

for (i = 0; i < 10;i++)

printf("%d/n",buf[i]);

close(testdev);

}

下面是我的Makefile文件(当然需要更改CC和INCLUDE的路径)

CC=/armTools/bin/arm-linux-gcc
INCLUDE=/home/lzg/elinux/include
MODCFLAGS:=-Wall -DMODULE -D__KERNEL__ -DLINUX -I$(INCLUDE)
armtest.o:test.c
$(CC) $(MODCFLAGS) -c $^ -o $@

编译后可以用insmod和mknod安装到系统中，当然也可以直接把驱动编译到zImage和Ramdisk中，具体可以参考linux driver开发的文章。